Data Inconsistency.

Q2. Define data inconsistency with the help of an example.
Ans. Data inconsistency occurs due to the problem of data redundancy. For example, you may have two or more copies of the same record stored at different locations in the database. The information in these copies may not match, which can be due to several reasons. One reason maybe that the user updates the records at one location in the database, but forgets to make the corresponding changes in the same data saved at other locations in the database. This leads to data inconsistency. In this case, it becomes difficult to know, which record is accurate. Moreover, the same data is present at different locations, which gives rise to data redundancy. Therefore, since the occurrence of one leads to the presence of other, you need to
control data inconsistency to control data redundancy.

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